John briggs



@einer tate atrut @fittizi JOHN BRIGGS, OF ROXBURY, MASSACHUSETTS.

` Letters .Patent No. 67,018, dated July 23, 186V.

IMPROVEMENT 1N VALVES.

@te Sagitta maar in ini tiger httetr wat ma mating part uf tige stmt.

.TO ALL WIIOM IT MAY CONCERN:

Be it known that I, JOHN BRIGGS, of Roxbury, inthe county of Norfolk,and State of Massachusetts, have invented certain new and usefulImprovements in Valves; and I do hereby declare that the following,taken in connection with the drawings which accompany and form part ofthis specification, is a description of my invention su'lcient to enablethose skilled in the art to practise it.

Formany uses it is very desirable to employ a valve which moves withease, as to opening or shutting the aperture which' it controls. Valveshave been made for this purpose, but they have not been of anorganization so simple and inexpensive as to secure their generallintroduction, and some of them have had defects, such as being renderedleaky by thermal changes, and being diieult to grind tight after wearingso as to leak.

I have shown in the drawing an illustration of my invention, in th-eform which it will ordinarily be made to assume, the drawing being asectional elevation of what is commonly known as a globe-valve, modifiedso as include my invention. Either end of the valve-case may be used asthe inlet, the other end, of course, being the outlet. The two 'ends ofthe ease are separated by a kind of pocket partition, shaped like theletter U, and cast integral with the-entire case, the pocket being solocated within the case that a taper valve-seat opening, concentric withthe axis of the stuing-box, may be formed in both walls of the pocket,in which seat a taper' plug-valve provided with a stem is made to t, andwhich operates, not by rotation on its axis, but by reciprocations inthe direction of the length of its axis.

, The outer case of the valve is marked a, and in this description l',will be considered the inlet, and e the outlet. The material forming thepocket is marked d, the taper plugvalve e, its stemf, and the stempacknga -box g. The case of the valve is provided in the line of thestemf, and opposite the standing-box, with a, serewplug, L, throughwhichthe taper plug-valve eis introduced to its seat. On the neck z',adjacent to the stuingbox g, and forming an integral part of the case a,is located a ring, 7c, provided with a fulcrum-post, Z, and fixed inposition on the neck z' by the set-screw m. The valve-stemfis slotted toreceive the short arm of bent lever n, which is pivoted to thefulcrum-post, and through which motion is communicated to reciprocatethe valve. s It will be obvious by slacking the set-screw m that thering 7c, its fulcrum-post, and the lever n, can be turned about the neckz', thus in many cases rendering it easy to make the connection with thevalve-stem from any direction. The linesin red on the drawing show achange of position of the fulerum-post of one hundred and eightydegrees. In drawing the valve is represented as closed upon its seat,and it is opened 4by moving toward the screw-plug or cap h, in whichease the inlet being at b'the directions of the currents will be thoseindicated by arrows marked on the drawing.

The valve constructed as described is nearly but not fully balanced, andwhen the end 6 is` used as the s inlet, the dilierence in the pressureexerted on the valve, caused by its taper form, is exerted to keep thevalve upon its seat. If thc end e should be used as the inlet, then thedifference in the pressure on the valve would be exerted to keep it oli`from its seat. When of sufficient importance this want of equilibriummay be compensated by properly weighting lever I claim thevalve,'construeted and arranged with the pocket partition between theoutlet and inlet, and with the taper plug-valve, substantially asdescribed.

Also, in combination therewith, the changeable fulcrum-post and lever,for the purpose specified. JOHN BRIGGS.

Witnesses Y J. B. CROSBY,

FRANCIS GOULD.

